// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "gin/try_catch.h"

#include <sstream>

#include "gin/converter.h"

namespace {

v8::Local<v8::String> GetSourceLine(v8::Isolate* isolate,
    v8::Local<v8::Message> message)
{
    auto maybe = message->GetSourceLine(isolate->GetCurrentContext());
    v8::Local<v8::String> source_line;
    return maybe.ToLocal(&source_line) ? source_line : v8::String::Empty(isolate);
}

} // namespace

namespace gin {

TryCatch::TryCatch(v8::Isolate* isolate)
    : isolate_(isolate)
    , try_catch_(isolate)
{
}

TryCatch::~TryCatch()
{
}

bool TryCatch::HasCaught()
{
    return try_catch_.HasCaught();
}

std::string TryCatch::GetStackTrace()
{
    if (!HasCaught()) {
        return "";
    }

    std::stringstream ss;
    v8::Local<v8::Message> message = try_catch_.Message();
    ss << V8ToString(message->Get()) << std::endl
       << V8ToString(GetSourceLine(isolate_, message)) << std::endl;

    v8::Local<v8::StackTrace> trace = message->GetStackTrace();
    if (trace.IsEmpty())
        return ss.str();

    int len = trace->GetFrameCount();
    for (int i = 0; i < len; ++i) {
        v8::Local<v8::StackFrame> frame = trace->GetFrame(i);
        ss << V8ToString(frame->GetScriptName()) << ":"
           << frame->GetLineNumber() << ":"
           << frame->GetColumn() << ": "
           << V8ToString(frame->GetFunctionName())
           << std::endl;
    }
    return ss.str();
}

} // namespace gin
